IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 84 / 252

Figure 34 shows an example of a redundant drive channel pair. If any component
of the drive channel fails, the RAID controllers can still access the storage
expansion enclosures in the redundant drive channel pair.
Note: In the following drive cabling figures, the DS3950 graphics are simplified to
show only the drive ports of each controller.
Overview of steps to connect storage expansion enclosures
to a storage subsystem
To connect storage expansion enclosures to the storage subsystem, perform the
following steps:
Note: The following procedures are for "cold-case" procedures (in which the
DS3950 is powered down when storage expansion enclosures are connected,
Drive
Channel 2, port 1
Redundant
Drive Channel
pair
Left ESM
Left ESM
Left ESM
Right ESM
Right ESM
Right ESM
Drive
Drive
Left ESM
Left ESM
Left ESM
Right ESM
Right ESM
Right ESM
Channel 2, port 2 Channel 1, port 1
Drive
Channel 1, port 2
Storage
subsystem
Figure 34. Example of a redundant drive channel pair
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide